Carcass cushion layer for radial tires

 

(57) Abstract:

Carcass cushion layer includes a set radius set of working layers with at least one layer of fibers oriented in the circumferential direction, and a set of protective layers with at least one layer of parallel fibers with the elongation at break in excess of this characteristic for fibers oriented along the circumference of a set of working layers. In the bus layer arranged in parallel along the circumference of the fibers included in the set of working layers and is the layer on the outside radius, with parallel fiber layer from a set of protective layers are oriented along the circumference. This increases the durability of the tire. 7 C.p. f-crystals, 2 Il.

The present invention relates to an automobile tire with a radial carcass, and in particular to the protection of their cushion layer.

Tires that are designed to work in harsh conditions, for example, on rocky soil or on the roads in the presence of sharp objects, as a rule, have a cushion layer, comprising a set of working layers, and located outside the radius of a set of protective layers. Layers are used for the perception of stress is least two spaced one above the other layer are stacked in each of these layers parallel to each other fibres moreover, the direction of these fibers cross each other, forming with the direction of the main tire circumference angles (, comprising from 10 to 45 degrees. Set the protective layer serves to protect workers layers against damage associated with strokes and punctures during operation, and it consists of at least a layer with spaced parallel fibers. Typically, these fibers can be extended up to rupture, more than fiber included in the protected operational layers.

To increase the service life of the carcass cushion layer of the tire in the application WO 96/20095 the proposed design of the tires, including the cushion layer, two sides and two sides, between which the fixed frame, and the frame of the cushion layer. At the same time frame cushion layer includes spaced in the direction along the radius of the working layers with at least one layer arranged in parallel and oriented along the circumference of the fiber, and a set of protective layers with at least one layer of parallel fibers with tensile at break, exceeding the figure for fiber layer along the circumference. In the working layers in the direction along the radius of the tire includes: a grid of crossed metal thread, orientirovan threads, oriented at an angle of 10 to 45 degrees. and the said working layer parallel along the circumference of the fibers located between the working layers. In this trunk fiber layer in the set of protective layers are oriented in the same way that the fibers adjacent the working layer from a set of working layers.

The present invention is to develop a new structure tyres, providing a significant increase in the durability of the carcass cushion layer and, in particular, increased shock strength, puncture resistance and chemical resistance during operation of coatings where the gravel with sharp edges.

In the subsequent text, the term "fiber" refers to single-stranded or mnogocelevoe fiber plexus filaments, spun yarn, or any other equivalent type of cord, and this remains true regardless of the type of material and its processing method, for example, the surface treatment material, the presence of membranes or pre-treatment of the surface to improve the adhesion with rubber.

The term "metal rope" refers to a filament capable of relative elongation is not more than"elastic metallic yarn" means filament, capable of relative elongation of more than 0.5%, when exposed to within 10% of the forces leading to its rupture.

The term "fiber oriented in the circumferential direction" refers to a fiber that is located almost parallel to the direction of the circumference of the tires, that is, when the deviation from this trend in any direction does not exceed 2.5 degrees. relative to the zero angle.

The term "fiber oriented along the radius understand fiber, which is mainly located in the same axial plane or in the same plane, forming with the axial plane angle not exceeding 10 degrees.

According to the invention of the automobile tire includes a cushion layer, two sides and two sides between which the fixed frame and the frame of the cushion layer. The composition of the carcass cushion layer are located in a direction radially outward of the working group and the protective layers. Layers include at least two spaced one above the other layer formed of parallel oriented in each layer of fibers, and the transition from layer to layer fiber as would intersect and form with the direction of the circumference of the tire angles, comprising from 10 to 45 deg., in addition to the Oh of parallel oriented fibers with tensile at break, exceeding this capability for fiber layer, where the fibers are parallel to the circumference. This tire is characterized by the fact that the layer with the fibers oriented parallel to the circumference, is part of the working layers and there is the outer radius of the layer, and the fact that parallel spaced fiber layer comprising protective layers are oriented along the circumference, and that the layer of parallel fibers oriented along the circumference of a set of working layers is in the axial direction of less width than the width of the lowest on this dimension layer among the workers layers, and it is narrower than the layer with fibers oriented along the circumference, which is part of the protective layer.

Orientation along the circumference of the protective layer and the adjacent layer from a set of working layers, and that the narrow layer of the carcass cushion layer is a functional layer with fibers oriented parallel to the circumference, all this according to the invention allows to significantly increase the resistance of the carcass cushion layer of the tire to the impacts, punctures and to improve its chemical resistance.

It is desirable that the ratio of the elongation at break of the fiber layer in the set protective layer of the layer stack, exceeded least 1.5. This results in the process of normal motion to the relaxed state of the fibers of the protective layer and provides maximum efficiency at the puncture resistance.

The invention is characterized by the fact that the width in the axial direction of the layer with fibers oriented along the circumference of a set of layers for protection lies in the range between the width of the narrowest and widest working layer.

Layer oriented along the circumference of the working set can be formed of elastic fibers with a complex characteristic that describes the link load with a relative elongation of the fiber, when its angle is small at small movements, and when the slope increases and remains constant for an appreciable loads. This layer can also be made from fibers that are located along the circumference, but they are cut so that their length considerably less than the length of the circumference of the layer. But for effective recovery efforts around the circumference, it is desirable that this layer consisted of inextensible metal thread.

Layer, part of the protective layers may be made of elastic metal thread or of synthetic fiber type polyamide.

Automobile tire R includes a radial carcass 1 (Fig.1) consisting of polyamide fibers and fixed on each of the sides. The frame 1 is covered cushion layer 3 consisting of a set of working layers 31 and a set of protective layers 32, which are located with respect to the working layer radially on the outside.

A set of working layers is formed on a radius starting from the inner layers, and is composed of the first working layer 311, consisting of inextensible metal filaments oriented with respect to the direction of the circumference at an angle , equal in this case to 22 deg., the second working layer 312 comprising the same as in the first working layer of metal thread and forming an angle relative to the circle, in the direction opposite corner and also equal to 22 degrees. (although this value may be different from 22°). and the third layer 313 of inextensible metal filaments oriented along the circumference.

Set the protective layer 32 consists of a layer of elastic metal filaments oriented along the circumference.

Car tyre according to the invention can be compared with a standard tire manufactured by the industry, which uses the carcass cushion layer with a set of working layers, including the layer with intersecting fibers and two working layers with fibers arranged at an angle to each other, and the bus has a set of protective layers, including a layer of elastic metal filaments oriented in the same direction as the fibers adjacent the working layer.

Operation test on the road, strewn with gravel of suitable size provided with sharp cutting edges, where the subjects tires were specialise saline due to the motion through the appropriate pool, showed high resistance is shown in Fig.1 tire according to the invention. When the gap prototype tire was made and carried out detailed analysis of wear, it was found that the tire according to the invention were two times less punctures in the tread up to the protective layer, in comparison with the control sample.

Because of this and the GP is along the circumference, located directly under the protective layer 321, does not lead to growth for the third layer of the number of injuries in the form of punctures and cuts. On the contrary, these tests demonstrate that the carcass cushion layer according to the invention significantly increases the resistance of the tyres compared to traditional designs.

In Fig. 2 in axial cross-section of another embodiment of the tire according to the invention. The tread 4 of the tire has three annular grooves 5. Typically, these grooves have a zigzag shape. In this embodiment, step, i.e. the space between the fibers of the layer 321' protective set 32' much less in zones 6 under the grooves than in the other zones of the tire. As a consequence, the protection by this layer 321' in zones 6 under the grooves 5 is more effective, and this occurs in areas where the risk of a puncture in the tread max. This allows you to coordinate protective functions with performance requirements without overspending metal frame cushion layer and, consequently, without increasing the weight of the tire.

Manufacturing tires according to the invention may be implemented on a rigid Foundation that defines the shape of the internal cavity. This ontologically manufacturing stage are mounted directly in the manufacturing process does not require any auxiliary operations. At the final stage automobile tire is molded and cured as described in U.S. patent 4 895 692.

The formation of two layers 313 and 321 when using fiber in the form of continuous filaments and by winding with a constant or variable pitch. No operations on adjustment has the advantage that it allows the use of non-metallic yarn as forming a functional layer 313 with orientation along the circumference.

1. Automobile tire containing the cushion layer, two sidewalls and two beads, attached to the frame, the frame of the cushion layer, which includes spaced radially outward set of working layers and a set of protective layers, and a set of working layers includes at least two working layers superimposed on one another and formed arranged in parallel in each layer of fibers, and the fibers of the two layers intersect each other and form with the direction of the circumference of the tire angles, comprising from 10 to 45 degrees, the layer arranged in parallel and oriented along the circumference of the fiber, there is a set of protective layers, including at m the tick for the fibers in the layer from the working set, oriented in the circumferential direction, characterized in that the layer of parallel fibers along the circle represents the outer radius of the layer from a set of working layers, with parallel spaced fibers from the specified protective layer in the set are aligned along the circumference, and the aforementioned layer of parallel fibers oriented along the circumference of a set of working layers in the axial direction has a width less than the width of the narrowest of the working layers, and smaller than the width of the layer with fibers oriented along the circumference, which is part of the aforementioned protective layer set.

2. Automobile tire under item 1, in which the ratio of the ultimate elongation at break of the fibers of the protective layer, where these fibers are oriented in the circumferential direction, the elongation of the fibers in the layer from a set of working layers, where they are also oriented parallel to the circumference greater than 1.5.

3. Automobile tire according to any one of paragraphs.1 and 2, in which the said layer with fibers oriented along the circumference of the protective kit has in the axial direction of the width between the width of the narrowest and the widest layer of the set of work the NOC, includes protrusions separated by annular grooves, and a layer with fibers oriented along the circumference of a set of protective layers alternating in the axial direction step when the maximum packing density of the radius of these fibers under these grooves.

5. Automobile tire according to any one of paragraphs.1-4, in which the fiber layer at the position parallel to the circumference of a specified set of working layers are composed of inextensible metal thread.

6. Automobile tire according to any one of paragraphs.1-5, in which the fiber layer at the position parallel to the circumference of a specified set of protective layers consist of an elastic metal thread.

7. Automobile tire on one of the PP.1-5, in which the fiber layer at the position parallel to the circumference of a specified set of protective layers consist of textile fibers.

8. Automobile tire on one of the PP.1-4, in which the fibers in the two layers at their orientation along the circumference are made from a polyamide material.

 

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